Julius boeddinghaus



(No Model.) f

J. BOEDDINGHAUS.

l 4 -SREVV FASTENER. No.' 556082' Patented Mar. 10, 1896,

l ma: @ww

PHOTGYLITNVU, WASHIN 5mi( 0 C UNITED STATES PATENT OEEICE.

JULIUS BOEDDINGHAUS, OF DUSSELDORF, GERMANY.

SCREW-FASTENER.

SPECIFICATION forming part of Letters Patent No. 556,082, dated March 10, 1896.

Application led J'uly 13,1895. Serial No. 555,875. (No model.) Patented in Germany May 10, 1894, No. 78,235; in Belgium .Tnly 13,1894,No.110,96'7,and11 France July 16, 1894, No. 240,053.

To a/ZZ whom t may concern:

Be it known that I, JULIUs BoEDDINGHAUs, a subject of the German Emperor, residing at Dusseldorf, Germany, have invented certain -new and useful Improvements in 'Screw-Fas# teners, (for which I have obtained a patent in Germany, No. 78,235, dated May l0, 1894; in France, No. 240,053, dated July 16, 1894, and in Belgium, No. 110,967, dated July 13, 1894,) with description as follows.

This invention relates to a fastener for effectively securing the screw-Shanks of hooks, eyes, nails, pins, and similar articles to walls or surfaces composed of wood, cast metal, earthenware, clay, glass, or porcelain, without injuring such Walls.

In the accompanying drawings, Figure 1 is a perspective view of my improved fastener'. Fig. 2 is a longitudinal section thereof; Fig. 3, an end View thereof.

The letter o represents a bolt, hook, eye, nail, pin, or other article which is provided with a screw-shank d adapted to be driven into a wall b. In order to secure this shank to its seat, I employ a spiral wire c, which is of such a diameter and pitch as to engage the bolt et between its threads. Thus the spiral c constitutes in eect a nut for the bolt. The spiral is provided with a multiple winding, Fig. 2, the outer winding c being of a greater pitch than the inner winding and serving to constitute a retaining-surface for securing the spiral to the wall.

In use a hole is bored into the wall, which is. a trifie wider than the diameter of the spiral. The spiral is then fitted into the hole and secured in place by plaster-of-paris, cement, or other binding material. Finally the shank c' (which may have a suitable head) is screwed into the spiral and will be thus firmly held in place.

If the spiral is to be secured to a body composed of glass, clay, porcelain, earthenware, or cast metal, it is fitted in place while the body is still liquid or plastic, and will thus become permanently attached upon the cooling or setting of such body.

What I claim is- The combination of a screw-shank with a nut or fastener composed of a multiple coiled wire, of which the inner winding is of smaller pitch than the outer winding and is adapted to be engaged by the thread of the screwshank, substantially as specified.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

JULIUS BOEDDIN GHAUS.

Witnesses ERNEST BUDE, WM. EssENwEIN. 

